Eruptions of the Yellowstone volcanic system have included the two largest volcanic eruptions in North America in the past few million years; the third largest was at Long Valley in California and produced the Bishop ash bed.
On the diesel Passat, the TDI badge stands for Turbocharged Direct Injection, which isn't really all that helpful as the gasoline-powered Passat is also turbocharged and also uses direct injection. Volkswagen attempts to clear this up by calling this Passat the Passat TDI Clean Diesel.
IFI may refer to: Illinois Family Institute. Industrial Fasteners Institute, the Independence, Ohio based trade and standards organization and publisher. InnerChange Freedom Initiative (IFI), a Christian prisoner program. The International Federation of Interior Architects/Designers (IFI), a global interior architecture/design umbrella organization.